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Programming the VT1422A for Data Acquisition and Control 115
Chapter 4
•
The
<sub_type>
parameter must specify:
-- For RTDs; "85" or "92" (for 100 ohm RTDs with 0.003
85
or
0.003
92
ohms/ohm/°C temperature coefficients respectively)
-- For Thermistors; only "5000" (See previous note on page 113)
-- For CUSTom; only "1"
•
The optional
<range>
parameter can be used to choose a fixed A/D
range. When not specified (defaulted) or set to AUTO, the module
uses auto-range.
Reference Measurement Before Thermocouple Measurements
At this point, the concept of the VT1422A Scan List will be introduced. As
each algorithm is defined, the VT1422A places any reference to an analog
input channel into the Scan List (this is in addition to those channels
specified by the ROUT:SEQ:DEF command, see "Defining an Analog Input
Scan List" on page 123). When the algorithms are run, the scan list tells the
VT1422A which analog channels to scan during the Input Phase.
The [SENSe:]REFerence:CHANnels (@<
ref_chan
>),(@<
meas_ch_list
>)
is used to place the <
ref_chan
> channel in the scan list before the related
thermocouple measuring channels in <
meas_chan
>. Now when analog
channels are scanned, the VT1422A will include the reference channel in the
scan list and will scan it before the specified thermocouples are scanned.
The reference measurement will be stored in the Reference Temperature
Register. The reference temperature value is applied to the thermocouple EU
conversions for thermcouple channel measurements that follow.
A Complete Thermocouple Measurement Command Sequence
The command sequence performs these functions:
•
Configures reference temperature measurement on channel 15.
•
Configures thermocouple measurements on channels 16 through 23.
•
Instructs the VT1422A to add channel 15 to the Scan List and order
channels so channel 15 will be scanned before channels 16 through 23.
SENS:REF THER, 5000, (@115)
5k thermistor temperature for
channel 15
SENS:FUNC:TEMP TC,J,(@116:123)
Type J thermocouple
temperature for channels 16
through 23
SENS:REF:CHAN (@115),(@116:123)
reference channel scanned
before channels 16 - 23
Summary of Contents for VT1422A
Page 2: ...This page is blank...
Page 8: ...8 Notes...
Page 22: ...22 Support...
Page 57: ...Field Wiring 57 Chapter 2...
Page 58: ...58 Field Wiring Chapter 2...
Page 96: ...94 Programming the VT1422A VT1529A B for Remote Strain Measurement Chapter 3...
Page 162: ...160 Programming the VT1422A for Data Acquisition and Control Chapter 4...
Page 224: ...222 Creating and Running Algorithms Chapter 6...
Page 419: ...VT1422A Command Reference 417 Chapter 7 Notes...
Page 420: ...418 VT1422A Command Reference Chapter 7 Notes...
Page 425: ...Specifications 423 Appendix A Thermocouple Type E 200 800 C SCPs VT1501 02 03A...
Page 426: ...424 Specifications Appendix A Thermocouple Type E 200 800 C SCPs VT1508 09A...
Page 427: ...Specifications 425 Appendix A Thermocouple Type E 0 800 C SCPs VT1501A 02A 03A...
Page 428: ...426 Specifications Appendix A Thermocouple Type E 0 800 C SCPs VT1508A 09A...
Page 429: ...Specifications 427 Appendix A Thermocouple Type E Extended SCPs VT1501A 02A 03A...
Page 430: ...428 Specifications Appendix A Thermocouple Type E Extended SCPs VT1508A 09A...
Page 431: ...Specifications 429 Appendix A Thermocouple Type J SCPs VT1501A 02A 03A...
Page 432: ...430 Specifications Appendix A Thermocouple Type J SCPs VT1508A 09A...
Page 433: ...Specifications 431 Appendix A Thermocouple Type K SCPs VT1501A 02A 03A...
Page 434: ...432 Specifications Appendix A Thermocouple Type R SCPs VT1501A 02A 03A...
Page 435: ...Specifications 433 Appendix A Thermocouple Type R SCPs VT1508A 09A...
Page 436: ...434 Specifications Appendix A Thermocouple Type S SCPs VT1501A 02A 03A...
Page 437: ...Specifications 435 Appendix A Thermocouple Type S SCPs VT1508A 09A...
Page 438: ...436 Specifications Appendix A Thermocouple Type T SCPs VT1501A 02A 03A...
Page 439: ...Specifications 437 Appendix A Thermocouple Type T SCPs VT1508A 09A...
Page 440: ...438 Specifications Appendix A 5k Thermistor Reference SCPs VT1501A 02A 03A...
Page 441: ...Specifications 439 Appendix A 5k Thermistor Reference SCPs VT1508A 09A...
Page 442: ...440 Specifications Appendix A RTD Reference SCPs VT1501A 02A 03A...
Page 443: ...Specifications 441 Appendix A RTD SCPs VT1501A 02A 03A...
Page 444: ...442 Specifications Appendix A RTD SCPs VT1508A 09A...
Page 445: ...Specifications 443 Appendix A 2250 Thermistor SCPs VT1501A 02A 03A...
Page 446: ...444 Specifications Appendix A 2250 Thermistor SCPs VT1508A 09A...
Page 447: ...Specifications 445 Appendix A 5k Thermistor SCPs VT1501A 02A 03A...
Page 448: ...446 Specifications Appendix A 5k Thermistor SCPs VT1508A 09A...
Page 449: ...Specifications 447 Appendix A 10k Thermistor SCPs VT1501A 02A 03A...
Page 450: ...448 Specifications Appendix A 10k Thermistor SCPs VT1508A 09A...
Page 454: ...452 Specifications Appendix A...
Page 480: ...478 VT1529A B Verification Calibration Appendix C...
Page 484: ...482 Glossary Appendix D Notes...